案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
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<html>
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<body>
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​
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Field1: <input type="text" id="field1" value="Hello World!">
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<br />
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Field2: <input type="text" id="field2">
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<br /><br />
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Click the button below to copy the content of Field1 to Field2.
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<br />
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<button onclick="document.getElementById('field2').value=
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document.getElementById('field1').value">Copy Text</button>
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​
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</body>
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</html>
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​